Double-opponent cells are ______.
A) Neurons that have a center, which is excited by one color, and a surround, which is inhibited by the opposite of that color
B) Neurons that are excited by one color but multiplied when combined with another color
C) Neurons that are excited by the input from rods, but not by inputs from cones
D) Neurons that have a center, which is excited by one color and inhibited by its opposite, while in the surround, the pattern is reversed